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SAMUEL B. PIERCE AND PEMBROKE PIERCE, OF HOMER, NEW Y OBK I Letters Patent No. 73,645, dated January 21, 1868.

IMPROVED CONCRETE ROOFING.

TO ALL WHOM IT MAY CONCERN:

7 Be it known that we, SAMUEL 13. French and Pnmenon'n PIERCE, of Homer, Cortland county, State of New York, have invented new and useful Improvements in Concrete Roofing, and we do hereby declare that the following is a full, clear, and exact description thereof.

Our invention consists in the complete mixture of the following-named ground,) (1) one part; asphnltum, (1) one part; coaltar, (1) onepart;

eight parts; gravel, one part; send,

(1) one pert; ashes, (1} one part; lime, (1) one part; and making ingredients: Rosendnle cement, (8)

sandstone, (ground,) (1) one part; rosin,

u we M: 1 I t thereof n'homogcneous and plastic mass, which may be applied to the roof of a building, or wherever desired, with a trowel or other suitable implement.

The above-described mixture, when npplied to the roof of a building, becomes hard, and is perfectly fireproof and impervious to water or dampness, and therefore will not crack by the action of frost or the heat of the sun, and makes an excellent, cheap, and convenient materiel for roofing purposes.

We do not wish to confine'ourselves to any specific proportions of the above-named ingredients.

Having thus fully describedour invention, what we claim es nemend desire to secure by Letters Patent, is

The mixture of the above-named ingredients, when used substantially as and for thepurpose specified.

In witness that we claim the foregoing,-wo have hereto set our hands in the presence of- SAML B. PIERCE, PEMBROKE PIERCE.

Witnesses Z. M. Conan, J. M. MASON. 

